added mm/stack module; initializing "permanent" stack for kernel use while paging, crashing when calling k_main() though...

git-svn-id: svn://anubis/hos/trunk@52 5b3e749e-e535-0410-8002-a9bb6afbdfca

kernel/mm/stack.cc

@@ -0,0 +1,14 @@
+
+#include "stack.h"
+#include "mm.h"
+#include "hos_defines.h"
+
+void stack_bootstrap()
+{
+    /*
+     * running from our temporary stack while segmentation is enabled,
+     * set up the "permanent" stack for use while paging
+     */
+    u32_t first_stack_page_base = mm_page_alloc();
+    mm_map(KERNEL_STACK_TOP - PAGE_SIZE, first_stack_page_base, 0, 1);
+}

kernel/mm/stack.h

@@ -0,0 +1,7 @@
+
+#ifndef STACK_H
+#define STACK_H
+
+void stack_bootstrap();
+
+#endif